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Gas Conditions Conversion Equations

The Gas Conditions calculations allow you to convert between normal, standard, and actual gas volumes.

  • An Actual Gas Volume is a volume measured at operating temperature and pressures.
  • A Normal Gas Volume is a volume measured at normal temperature and pressure, 0 °C and 1 atm respectively.
  • A Standard Gas Volume is a volume with reference conditions based on a site-defined standard of temperature and pressure.

The following are the relative conversion equations.

Gas Standard Flow to Gas Actual Flow​

The conversion of standard gas flow to actual gas flow requires the temperature, pressure, and the compressibility factor.

Where:

P = Pressure at actual conditions

Ps = Standard pressure. The value is from the Global Factors element, SF_GlobalFactors.

T = Temperature at actual conditions, units in

Ts = Temperature at standard conditions. The standard conditions are defined in the Global Factors element, SF_GlobalFactors.

V = Gas flow at actual conditions

Vs = Gas flow at standard conditions. Standard conditions are defined in the Global Factors element, SF_GlobalFactors.

Z = Gas compressibility factor at actual conditions, default = 1

Zs = Gas compressibility factor at standard conditions, default = 1

Note: The formula shows T and Ts in Fahrenheit units (˚F). The factor 459.67 is a conversion into the Rankine scale.

Gas Actual Flow to Gas Standard Flow​

The conversion of actual gas flow to standard conditions flow requires the temperature, pressure, and the compressibility factor.

Where:

P = Pressure at actual conditions

Ps = Standard pressure. The value is from the Global Factors element, SF_GlobalFactors.

T = Temperature at actual conditions

Ts = Temperature at standard conditions. The value is from the Global Factors element, SF_GlobalFactors.

V = Gas flow at actual conditions

Vs = Gas flow at standard conditions. Standard conditions are defined in the Global Factors element, SF_GlobalFactors.

Z = Gas compressibility factor at actual conditions, default = 1

Zs = Gas compressibility factor at standard conditions, default = 1. The value is from the Global Factors element, SF_GlobalFactors.

Note: The formula shows T and Ts in Fahrenheit units (˚F). The factor 459.67 is a conversion into the Rankine scale.

Gas Normal Flow to Gas Actual Flow​

The conversion of normal gas flow to actual gas flow requires the temperature, pressure, and the compressibility factor.

Where:

P = Pressure at actual conditions

Ps = Pressure at normal conditions. The value is from the Global Factors element, SF_GlobalFactors.

T = Temperature at actual conditions

TN = Temperature at normal conditions. The value is from the Global Factors element, SF_GlobalFactors.

V = Gas flow at actual conditions

VN = Gas flow at normal conditions. The value is from the Global Factors element, SF_GlobalFactors.

Z = Gas compressibility factor at actual conditions, default = 1

ZN = Gas compressibility factor at normal conditions, default = 1. The value is from the Global Factors element, SF_GlobalFactors.

Note: The formula shows T and Ts in Fahrenheit units (˚F). The factor 459.67 is a conversion into the Rankine scale.

Gas Actual Flow to Gas Normal Flow​

The conversion of actual gas flow to normal conditions rate requires the temperature, pressure, and the compressibility factor.

Where:

P = Pressure at actual conditions

Ps = Pressure at normal conditions. The value is from the Global Factors element, SF_GlobalFactors.

T = Temperature at actual conditions

TN = Temperature at normal conditions. The value is from the Global Factors element, SF_GlobalFactors.

V = Gas flow at actual conditions

VN = Gas flow at normal conditions. The value is from the Global Factors element, SF_GlobalFactors.

Z = Gas compressibility factor at actual conditions, default = 1

ZN = Gas compressibility factor at normal conditions, default = 1. The value is from the Global Factors element, SF_GlobalFactors.

Note: The formula shows T and Ts in Fahrenheit units (˚F). The factor 459.67 is a conversion into the Rankine scale.

Gas Standard Volume to Gas Actual Volume​

The conversion of standard gas volume to actual gas volume requires the temperature, pressure, and the compressibility factor.

Where:

P = Pressure at actual conditions

Ps = Standard pressure. The value is from the Global Factors element, SF_GlobalFactors.

T = Temperature at actual conditions

Ts = Temperature at standard conditions

V = Gas volume at actual conditions

Vs = Gas volume at standard conditions. Standard conditions are defined in the Global Factors element, SF_GlobalFactors.

Z =Gas compressibility factor at actual conditions, default = 1

Zs = Gas compressibility factor at standard conditions, default = 1. The value is from the Global Factors element, SF_GlobalFactors.

Note: The formula shows T and Ts in Fahrenheit units (˚F). The factor 459.67 is a conversion into the Rankine scale.

Gas Actual Volume to Gas Standard Volume​

The conversion of actual gas volume to standard conditions requires the temperature, pressure, and the compressibility factor.

Where:

P = Pressure at actual conditions

Ps = Standard pressure *

T = Temperature at actual conditions

Ts = Temperature at standard conditions

V = Gas volume at actual conditions

Vs = Gas volume at standard conditions. Standard conditions are defined in the Global Factors element, SF_GlobalFactors.

Z =Gas compressibility factor at actual conditions, default = 1

Zs = Gas compressibility factor at standard conditions, default = 1. The value is from the Global Factors element, SF_GlobalFactors.

Note: The formula shows T and Ts in Fahrenheit units (˚F). The factor 459.67 is a conversion into the Rankine scale.

Gas Normal Volume to Gas Actual Volume​

The conversion of normal gas volume to actual gas volume requires the temperature, pressure, and the compressibility factor.

Where:

P = Pressure at actual conditions

Ps = Pressure at normal conditions. The value is from the Global Factors element, SF_GlobalFactors.

T = Temperature at actual conditions

TN = Temperature at normal conditions

V = Gas flow at actual conditions

VN = Gas flow at normal conditions.

Z = Gas compressibility factor at actual conditions, default = 1

ZN = Gas compressibility factor at normal conditions, default = 1

Note: The formula shows T and Ts in Fahrenheit units (˚F). The factor 459.67 is a conversion into the Rankine scale.

Gas Actual Volume to Gas Normal Volume​

The conversion of actual gas volume to normal conditions requires the temperature, pressure, and the compressibility factor.

Where:

P = Pressure at actual conditions

Ps = Pressure at normal conditions. The value is from the Global Factors element, SF_GlobalFactors.

T = Temperature at actual conditions

TN = Temperature at normal conditions

V = Gas flow at actual conditions

VN = Gas flow at normal conditions.

Z = Gas compressibility factor at actual conditions, default = 1

ZN = Gas compressibility factor at normal conditions, default = 1

Note: The formula shows T and Ts in Fahrenheit units (˚F). The factor 459.67 is a conversion into the Rankine scale.